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Finding the Fourth Proportional to 12,972.90, 19,422.90 and 12,608.40

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Solution

The fourth proportional to 12,972.90, 19,422.90 and 12,608.40 is: 18,877.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,972.90 : 19,422.90 = 12,608.40 : x
  2. Step 2: Convert to fraction form
    12,972.90/19,422.90 = 12,608.40/x
  3. Step 3: Cross multiply
    12,972.90x = 19,422.90 × 12,608.40
  4. Step 4: Simplify right side
    12,972.90x = 244,891,692.36
  5. Step 5: Solve for x
    x = 244,891,692.36/12,972.90
  6. Step 6: Final answer
    x = 18,877.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.